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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'd3e25363999cbb59ee04c846d3629550db35e25db720fabd917f31fb4c6c10b2' 
  AND token = 'bIrG136iK511zeWN1WW4hHCg4IoiG3DSIG1RB/h7Cdc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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