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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '4a81acfd2e561fb0c8a1db7b129375d692196f6787a89db98e147c395effe84a' 
  AND token = 'WdROEq/nCiAUMksUPAe+b4wYkRGJTWSGYJ9Cs1Ttj/Y=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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