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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '56f6b524be5fa53f9ef62cffb2d355f0d85db910eb5443c4bcaef3854d64acb8' 
  AND token = '1UbxBaXsk7toUtaWOnr4hga70nmehIgj6usKipx1LD4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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