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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'ff3326cb3fb1d6cf68cb04cfe57ac1af71a3a0425e76163e33335f16bce6b719' 
  AND token = 'rOhDEfb4RpYXNUW12myZylPrmkZSmXQliBJ+V+16u4g=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00041

JSON explain

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