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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'd0c34bc47c032bcea8aff8b4dc215cf7a4204d041d97a1db95a33999799197f9' 
  AND token = 'p3LXjQ8EQ/dJJdTeNguQGeKqwOY9Ftkd/iFqOHWUw7I=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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