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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '3eff740fefae18e28cbb7d6bef3d84c908496cb02ba57d3d1ccfe268e41d6f68' 
  AND token = 'xxa4F4w3rvAEhW8/jqW5mqiEoMBmQ/iR/t2nhUz1X68=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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