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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'dbbd46bc13bace4c25a1cf5eba477a1066e797f4354c6088caa10e5b9ff7e3f6' 
  AND token = 'nkWyxv/aFwmL+CBgNQnRA7yO/HhoCSHNfyLIki6jKNw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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