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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'a0b7e083e1c8ef7c4ae67f9b6d486ceb83eceebedc4429091b8733927f2914a6' 
  AND token = '09RC4iqrMxLt2UBeRIaa8ksJNPjjpoeZj3Rs60weKdo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00042

JSON explain

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