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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '020595e315616b1921feabd847400553aa5f481970451feb37f469f4344ce771' 
  AND token = 'JOXvNR3e0PVzWfF/cGEdzTR8q+NUio/iHco+9aq+SuI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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