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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'cc493a73eb65f79ed05a1c4638f91c4e160d6e8a09a8c53a3bcdb99272492b13' 
  AND token = 'oA8lhIeja7+phvu8i3zPHnS4VCNVZLX4tPebRQ7a29Y=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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