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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '861f24187271e6f1afa7f934b3f6865510dbc62d807ea7587bd27fc915345be7' 
  AND token = 'T8ekWML/g1j1QxhZgN78H0sQOLo7pDUNlGFWmImlW7Q=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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