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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'f9119bc7dff70f762768fa3b8aabfed6784de0c5bb9d30cdd8fda670a5fe281d' 
  AND token = 's5AI+wF71WX8gItpmradZsSk9/AWPrZ1j2AKalag5No=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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