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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '2445deef50c82cb504c9a42f6bdcaf261e50125e144ffa97066b4be1589869ed' 
  AND token = 'VgfTn4QnJQfKe3iKFSwH1OoQbcZ6YK7FwXNSpY8SjjE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00055

JSON explain

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