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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'e35dbb51450a987d6fcc24c5fd3cdaf0d3340e0074ab94085db1fe690c0dd5f4' 
  AND token = 'P7aMM3LY7/pQnPFRjIO8Iq2aYPKumuVuyoeM1l6QG9A=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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