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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'e72e579d5d262f076b88046cc154bcc948c04be414db1dc0a8e3c2801b561694' 
  AND token = 'ajDqR8PaIwx+iy54mr8+Y8bZWN4au0QlA6ACf7diYkQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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