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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '92c0ce32273de2a7af3e0fce8a0f749e4f8217c879a4f2ec769c81346a2e1d7a' 
  AND token = 'lB5N01b3SMkjlVBLzwkQZI8s3wIsjOWVrguKCIz3r40=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00043

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}