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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '4d252dc2a5ef58764fa8cca83875c37ab69c397b13b43806dcffa8ad64331ccb' 
  AND token = 'irDROXPEsUVV9bgGaMAXqegJiywcyex5eMkMrVkpCpc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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