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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'c9c5e6d43435156fb0a2442b12960d4261c0f1926da2b443f5986f980d882f7c' 
  AND token = 'LYTLabgSUaTLM/WdFuxcgfHmnMQ6rpA5cAn2tu1BIk0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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