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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '4841061385bf9c14ef7115d1ae701d6baaed021f64344458351435e5425dc305' 
  AND token = 'kPZxU0x+3hngG1ob16TSbb2XDKCyOEB7vIOpAG0qmsw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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