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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'c4ac10456f42f5c77b2392d7ea0bdffe75e75be7718c630d99a02895d26c261a' 
  AND token = 'PdSn80NZ4sIfUjBrrCRH7q6SRzTuk4+Mf3bePU0zbFc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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