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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '62cdd7c0f9bd752b9fb781b79dd64b6e6dfdfe6db02c4781eab0f666babf728b' 
  AND token = 'Tr+Mz8oVfH+IKtm+uv7GRv9epT0aApVUOxVzF3yjKpc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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