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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '5fca07b7bc1dbf0682f5cc64ce94bba23bbd76f5522fa9201539feffcd3b0903' 
  AND token = 'e1cA6SOg8FR2rFZsrO5r0OrQB6nAdy9pXtfOPW8+EUE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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