SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '03c2c5632259c2fa337fd7a2a907461da84ba54e7272daa0a921d536f39eedf3' 
  AND token = 'Y/bv7RS1SsGzyyUvjsgufD0XGGm4BgeH4WfQh+qbG2U=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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