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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'cbc050beb510080b6d3c820c5aa9e9ed93ad8ec583b69628d1a1f72b2aec5483' 
  AND token = 'Fm5qxl8WcOQc+P/EWTkLMQ6spHa4j+xQK9fhm8df+3A=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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