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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '1cd96a997f074c179782cb21c01407287969a5772b2b922ef9ce0425e4508ac4' 
  AND token = 'rYJeSdTPWJ/K/089kk6kZM1lJECPgpGb624VOicwGDs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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