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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '3594f2be6598802264d71b31794eaaff031cc10cc840d6210d1413f3ce6ccffe' 
  AND token = 'G1A0q8sOiTzH7raVbSi8TV7MqTg3qdnlrRbYQwueNAQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00050

JSON explain

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