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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'e53ab3e8b7cd74d2dbaffe6121e3b6d13aedfbae351258f3c682dd2cddab1b01' 
  AND token = '9U8XbafpMcL6EJKqGDeCvMYFq8piH/9nH0DGTh15aEs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00041

JSON explain

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