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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'f740dd987f93fb319289b45d3659b2451df1f7814e6474fbdc71de3cc211c67c' 
  AND token = 'IadKQo2C7wAKlrzsKyOr8IE1tw+kGXP8iih6cQys1YY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00041

JSON explain

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