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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '80083a0d453cac0dd03b5f3a1a92985a1d2a6a524ff26fd13e23db49867c1919' 
  AND token = 'ItbdLTFITGXduR+5gEL/Rcvqc6bi5MgjW2yFJ4mOZvk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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