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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '81f76a6fe125598824af6eb5e7d286c2236f45a5f1be31aeb17c9efe40569940' 
  AND token = 'dPQ4VWC013zcDU7rwdq+W3Wb/1nkb54vnGlikjV4pk8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00041

JSON explain

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