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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '7ebf709a247a7feebf4859d5c3946b080603e58a398f84966d84ff95e794fa47' 
  AND token = 'pNuwZ3eWwEqMxRvY9TbiwVxQg/JndDvOZ0Ubb5upAMM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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