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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '07a42f10a149c915ca4e18823074edd7b20793598f15acdea6e4360344b89e81' 
  AND token = 'a4HU0AwzpRlIG6JBdAkrZCaJIo78kf9zqzg4RpNtOLc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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