SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'abbf8fe1b02b16b745bba8e07ca88653a134d3871fca1dcba2176a39ad6d0229' 
  AND token = 'KSbJVcDhHSKuOzIRLWD4pjj63n5iVIUv6eqHYu3m/70=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00041

JSON explain

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