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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'fce7bb9635764cafc6431e8fa645c6fc153a7ccf1937396dba8eb10e1d6bf501' 
  AND token = 'gc4RPIWWIUBPN56Q6B9EBdPBsbAsPE3U+BC86A+OrFY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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