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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '5a422ff955674e07f0e967b4370b1dfa37b78d3a406b181df243dca74aa1bec1' 
  AND token = 'SC6kMw8lU9DvSFnaEZI1qx33/IVovc4/K76ViU+VY84=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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