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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '35e3300d8bd8c3b35b606d3468cea5194df0926f0e20bff157f7b9c96cfd7f0b' 
  AND token = '3HK6Eej2ejkB1BzC6QX7axm8ZS3SaPDUDDLJv2Ud0c0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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