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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '973b33a2027710360b368fb8ebd7b5dbd51b9ea8542aa19269b0481a2f546ed7' 
  AND token = '6OTUz2W3NVE27oiwdvyx2gXqgiHeD+a0o6WZ29+iDU8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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