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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'e84c01c05592724e8d1c6639cbd84ee82442db71b4378eaf3ce306e2da0ef219' 
  AND token = 'LTEpeMJG8xFLXP+LakIqo/EDozt3SeD5RPn7WCpaw5M=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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