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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '9aabb802d916235d618f4d1a5966ca55d4f3f501703ec37f67bfbf6ac1358d2d' 
  AND token = 'rzw/oOSgIJ0dZcYFCAXyl0A53oFov5N1LkTP7gbHMkc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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