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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'b511d2587a63ad68b98c2b63a2e7086a99a3bbeec79d273d3537a066a804f600' 
  AND token = 'HeS65Qn3zJ4W0aZdg3SLQBBaMuDRZqDHFJ9auaBFjCo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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