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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '94d3a9a542d48f4e3066940b7abc19c98808399926ad86559e634ad35ccbda80' 
  AND token = '9g12S/+qsWBVxNf31zL9MuEKGOiaWfdikj5IJrcRwI8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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