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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '4a978a638c12e23b8c2dd5abd149f8db7eee42e55944cdf2e4ef391dff578fd0' 
  AND token = 'xi4r4gMjeJbKZF0KtR7KWi2Cnm5UNFbkRh3qjdJqH08=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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